In this picture released by the Vatican newspaper L'Osservatore Romano, cardinals take an oath of secrecy and make their way to their seats inside the Sistine Chapel at the Vatican, Tuesday, March 12, 2013, before they start the conclave to elect the 266th Roman Catholic pope. Cardinals from around the globe locked themselves inside the Sistine Chapel on Tuesday to choose a new leader for the world's 1.2 billion Catholics and their troubled church, surrounded by Michelangelo's imposing frescos imagining